Filter septum
AssigneeHydroflow, Inc.
InventorBarry L. Nehls
Life of this patent
Estimating the term…
Abstract
A filter septum is constructed with a stainless steel sheet microscreen element which has uniformly distributed apertures through which a liquid to be filtered is passed from an inlet side to an exit side of the element. The apertures are preferably tapered from a larger diameter at the inlet side to a smaller diameter at the exit side of the microscreen element. A supporting metal base plate having rows of uniformly distributed holes which are larger then the apertures is brazed to the microscreen element bonding the exit side of the microscreen element to the inlet side of the base plate. Preferably the inlet side of the microscreen element is Teflon.RTM. coated.
Claims20
A filter septum comprising:
- a metal sheet microscreen element having uniformly distributed apertures through which a liquid to be filtered is passed from an inlet side to an exit side of said element, said apertures having a taper from a larger diameter at said inlet side to a smaller diameter at said exit side of the microscreen element, said apertures having been former by an electrochemical process;
- a metal base plate having an inlet and an exit side and rows of uniformly distributed holes larger than said apertures;
- and
- a layer of brazing alloy between said base plate and said microscreen element bonding the exit side of the microscreen element to the inlet side of said base plate.
A filter septum comprising:
- a stainless steel sheet microscreen element having a thickness of 0.003" and 0.015" and containing uniformly distributed apertures having a diameter between 0.003" and 0.015" but not less than the thickness of the sheet;
- a stainless steel base plate having a thickness of at least 8 times the thickness of said microscreen element and having rows of uniformly distributed holes with a diameter of at least 10 times the diameter of said apertures;
- a layer of brazing alloy between said base plate and said microscreen element bonding an exit side of said microscreen element to an inlet side of said base plate;
- and
- a plastic coating on an inlet side of said microscreen element.
A method of producing a filter septum comprising the following steps:
- A. forming a microscreen element by using an electrochemical process to produce uniformly distributed apertures in a metal sheet, said apertures having a taper from a larger diameter at an inlet side of said element to a smaller diameter at an outlet side of said element;
- B. producing a perforated metal base plate having uniformly distributed holes larger than the apertures in the microscreen element;
- and
- C. brazing the microscreen element to the base plate thereby bonding the exit side of the microscreen element to an inlet side of the base plate.
A method of producing a filter septum comprising the following steps:
- A. forming a microscreen element by using a photo etching process to produce uniformly distributed apertures in a stainless steel sheet;
- B. providing a perforated stainless steel base plate having uniformly distributed holes larger than the apertures in the microscreen;
- C. brazing the microscreen element to the base plate thereby bonding an exit side of the microscreen element to an inlet side of the base plate;
- and
- D. coating an inlet side of the microscreen element with a fluorinated ethylene propylene.
Dependencies are inferred from the claim text.